Fan



June 8, 1937. E. L. ANDERSON FAN Filed March 25, '195e ATTORN EYS Patented June 8, 1937 FAN Edward L. Anderson, Detroit, Mich., assignor to American Blower Corporation, Detroit, Mich., a corporation of Delaware Application March z3, 193s, serial No. '10,197

s claims. tcl. 23o-114) My invention relates t'o blowers. It is the particular object of my invention to provide means of controlling the volume of air delivered by the blower and the direction of the 5 air entering the blower. A

. It is a special object to provide such means `within the blower rotor. I

In particularI it is the object to provide a plurality of vanes into the Venturi throat of the l blower inclined to the axis of rotation of the blower and the axis of air ow into the blower so that a major portion of the vanes will extend beyond the end of' the air inlet passageway andthe Venturi throat at the inner end thereof.

I It is a furtherB object to be able to adjust the position of these vanes to a pointl exterior of the blower with all the operating mechanism inside of the blower.

Referring tothe drawing, Figurel is a section through the air inlet passageway, a blower casing and rotor and the inner supporting hub for the air control vanes, and through a part of the V adjusting mechanism therefor.

Figure 2 is a section on the line 2-2 of Figure -1 looking in the direction of the arrows.

Referring to the drawing in detail, I is an axle mounted on the bearings 2-2. This axle or rotor shaft is driven by any suitable source of power. It carries within the housing 3 the rotor I which is provided with a hub 5 supporting the back plate 6. The back plate is provided with a plurality of arcuate air moving blades 1, the other ends of which'carry the ring 3 that overlaps at its inner side the inner end 9. of the Venturi throat Ill .of 'the conical air inlet passageway Il.

The axles I2 carryingrthe guide vanes I3 are pivotally mounted in the Venturi throat I0. The inner ends of-these axles arev pivotally mounted in the tapered hollow hub Il. The vanes I3 and their axles I2 are rotated by the beveled pinions I5 on the ends of the axles I2, being engaged by the ring gear I6 which is rotated by the handle i1 and link I8 from a point outside the casing 3.

By adjustingthe angularlty o f the vanes, the

direction ofthe air as to its preliminary whirl is controlled and the quantity of air deliveredk by the rotor of the blower is also controlled for discharge through the discharge outlet I9.

By mounting` these guide vanes I3 partially in the Venturi throat but largely within the rotor and at right angles to the general ilow of a'ir from' `the Venturi throat overthe tapered'hub I4,it is possible to secure very accurate control as tol 1 direction and volume without setting up turbnff.. 5 5 l'enceV in the rotor. It also results iai the directing of the air in a uniform path over the entire area of the blades 'I of the rotor. The reentry of the air through the passageway 20 assists in this distribution so that` the entire area of the blades 'I is effectively utilized.

The course of the entering air is as follows:

' 'I'he air enters through the inlet cone I I where its` diameter is reduced; .it then passes through the Venturi. throat and expands; as it does that it` starts to turn in a turn that amounts to about o degrees from the horizontal flow to flow in a vertical direction over the blades 1. The vanes I3 have their axes at an angle of about 45 degrees or halfway around this turn of 90 degrees. The outer ends ci the guide vanes I3 which are within the Venturi throat start to guide the air in a whirling path and control the volume of it. These A ends are designated 2|. The air, therefore, as it turns from the horizontal to the vertical direction, is guided and controlled. When I say from the horizontal to the vertical direction, I am referring to the view in Figure 1, but, of course, it will be understood that this 90 degree turn takes place through all degrees of the compass as the air expands and is guided by the 'vanes I3 25 throughout the entire -360 degrees, forming th lip 3 of the Venturi throat I0.

It will be understood that it is desired to comprehend within this invention such modifications as may be necessary to adapt it to varying con'- 30' ditions and uses.

Having thus fully described my invention, what I claim is new and desire to secure by Letters Patent, is:

l. In a blower, a casing, a rotor, a telescopi- 35 cally arranged'air inlet Venturi throat'arranged within but spaced from said rotor to permit the reentry of air on the outside of the Venturi throat, and radially extending guide vanes having their outer ends disposed in the Venturi throat 40 and their -inner ends disposed within the rotor for guiding the air on the inside of the Venturi throat substantially parallel to the ow 0 1' the l air on the outside of the Venturi throat.

2. In combination, in a blower, -of a blower cas- 45 ing, a rotor, a conical air inlet passageway having a'Ventu'ri throat o'n the ,inner end thereof arranged within but spaced from said rotor, to

.permit the re-entry of air from the outside of the Venturi throat, and vanes disposed at an angle 50 oi' about 45 degrees tothe axis of rotation of the blower andthe axis of entry of the air, said vanes being `so arranged that their inner ends extend partially within the Venturi throatand partially within the rotor. y

3. In combination, in a blower, of a blower casing; a rotor. a conical air inlet passageway havbeing arranged partially within the Venturi throat and partially within the rotor, and a conical hub supporting the inner ends of the vanes and disposed within the rotor and guiding the air from its axis of entry to its plane of discharge by the 5 blower rotor.

EDWARD L. ANDERSON. 

